In these days of soaring fuel prices everyone is concerned about the efficiency of their
appliances. The energy consumed by the electric motor represents a large portion of the
total energy used in electric appliances such as refrigerators, air-conditioners, and
washing machines. Thus, many manufacturers are now using three phase, permanent
magnet, inverter driven, variable speed motors to achieve their efficiency goals.
Two common motors are the brushless direct current (BLDC) motor, and the brushless
alternating current (BLAC) which is also known as the permanent magnet synchronous
motor (PMSM). These motors are intrinsically more efficient than the induction motor
because the magnetic field of the rotor is supplied by the permanent magnets rather than
by the electromagnet used in the induction machines. Thus, they are suitable for the new
generation of appliances.
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